Please can somebody explain the listener on the react extensions-boilerplate example

[BarryCarlyon]

That function will listen to messages broadcast to the TwitchPubsub.

You can use

Extensions Reference

To broadcast such a message.

@retro

And how is there is no websocket connection made.

Their is one made to the Twitch PubSub system. It’s not made to your EBS but the main Twitch PubSub